Conducting investigations under limited connectivity

ABSTRACT

Systems and methods are provided for obtaining and providing one or more resources for an investigation to be conducted remotely from a server. Resources needed to conduct an investigation may include one or more portions of a database and/or one or more functionalities of a data analysis platform. Based on the investigation to be conducted (e.g., type of investigation, location of investigation, personnel involved, etc.), a computing system may obtain different amounts/types of resources from the server. The investigation may be conducted via a web application that runs on the computing system. The web application may access the resources obtained from the server. The results of the investigation may be sent by the computing system to the server. The computing system may receive updates from the server. The computing system may act as a server for other remote systems that are conducting investigations.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 16/730,908, filed Dec. 30, 2019, which is a continuation of U.S. patent application Ser. No. 16/023,286, filed Jun. 29, 2018, now U.S. Pat. No. 10,523,787 B2, which is a continuation of U.S. patent application Ser. No. 15/383,812, filed on Dec. 19, 2016, now U.S. Pat. No. 10,044,836 B2, the disclosures of which are expressly incorporated herein by reference in their entirety.

FIELD OF THE INVENTION

This disclosure relates to approaches for conducting investigations while having limited network connectivity with a server.

BACKGROUND

Under conventional approaches, a client application for conducting investigations may be deployed on a mobile device. The client application may need to access resources hosted on a server to conduct the investigation. If the connection between the client application and the server is lost or poor, the user may be unable to obtain the resources necessary to conduct the investigation. As a result, a user's ability to conduct the investigation may be limited by the availability of sufficient connection/bandwidth between the client application and the server.

SUMMARY

Various embodiments of the present disclosure may include systems, methods, and non-transitory computer readable media configured to facilitate conducting investigations while having limited network connectivity with a server. A server has access to resources required by an investigation application to facilitate an investigation by one or more users. Various embodiments of the present disclosure may include systems, methods, and non-transitory computer readable media configured to receive from the server one or more resources for the investigation to be performed remotely from the server; and providing one or more resources to the investigation application that facilitates the investigation. One or more provided resources enable the investigation application to facilitate the investigation without an active connection to the server.

In some embodiments, one or more resources include one or more subsets of one or more databases accessed by the server. In some embodiments, one or more resources include one or more functionalities for the investigation application.

In some embodiments, the investigation application is executed by the system. In some embodiments, the investigation application is executed on a computing device remote from the system.

In some embodiments, the systems, methods, and non-transitory computer readable media are configured to receive one or more updates for one or more resources from the server.

In some embodiments, the systems, methods, and non-transitory computer readable media are configured to send a result of the investigation to the server. The results of the investigation may be received by the system from the computing device remote from the system.

These and other features of the systems, methods, and non-transitory computer readable media disclosed herein, as well as the methods of operation and functions of the related elements of structure and the combination of parts and economies of manufacture, will become more apparent upon consideration of the following description and the appended claims with reference to the accompanying drawings, all of which form a part of this specification, wherein like reference numerals designate corresponding parts in the various figures. It is to be expressly understood, however, that the drawings are for purposes of illustration and description only and are not intended as a definition of the limits of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Certain features of various embodiments of the present technology are set forth with particularity in the appended claims. A better understanding of the features and advantages of the technology will be obtained by reference to the following detailed description that sets forth illustrative embodiments, in which the principles of the invention are utilized, and the accompanying drawings of which:

FIGS. 1-3 illustrate example environments for conducting investigations while having limited network connectivity with a server, in accordance with various embodiments.

FIG. 4 illustrates an example interface for determining one or more resources for an investigation, in accordance with various embodiments.

FIG. 5 illustrates a flowchart of an example method, in accordance with various embodiments.

FIG. 6 illustrates a block diagram of an example computer system in which any of the embodiments described herein may be implemented.

DETAILED DESCRIPTION

A claimed solution rooted in computer technology overcomes problems specifically arising in the realm of computer technology. In various embodiments, a computing system is configured to access and obtain from a server resources needed to conduct an investigation remote from the server. Resources needed to conduct an investigation may include a portion of a database and/or one or more functionalities of a data analysis platform. Based on the investigation to be conducted (e.g., type of investigation, location of investigation, personnel involved, etc.), different amounts/types of resources may be obtained from the server. By obtaining a subset of resources from the server, the computing system is able to (1) conduct the investigation without any active connection with the server, and (2) maintain a compact database/application that is necessary to conduct the investigation. The investigation may be conducted via a web application that runs on the computing system. The web application may access the resources obtained from the server. The results of the investigation may be sent by the computing system to the server. The computing system may receive updates from the server. In some embodiments, the computing system may act as a server for other remote systems that are conducting investigations. The web applications running on the other remote systems may access the resources from the computing system. The results of the investigation may be send by the other remote systems to the computing system, which may then send the results to the server.

As used herein, the term “investigation” refers to a line of inquiry or analysis using a subset of a database provided by a server. The subset of the database is provided to a client device, and the client device (or another client device served by the client device) executes a data analysis platform that exposes the subset of the database. During an investigation, the data analysis platform may be used to explore different aspects of the subset of the database, make changes to the subset of the database, and/or create new records for the subset of the database. An investigation may be shared by multiple users—multiple users may collaborate on a single investigation via multiple client devices—or individual users may have their own separate investigations—individual users may work on individual investigations via individual client devices.

The invention disclosed herein enables users to conduct investigations in locations without an active network connection with a server that hosts the resources for conducting investigations. The invention enables a user to obtain a subset of resources from the server and use the subset of resources to conduct the investigation in locations without an active network connection with the server—i.e., in locations where a network connection to the server may be only periodically available, unreliable, or nonexistent. For example, emergency responders may be planning on conducting a search-and-rescue mission in a location where the geographic/terrain/weather (e.g., mountainous regions, underground tunnels, stormy conditions) interferes with an active network connection with the server and/or in areas where the network connection is unreliable (e.g., communication towers are inoperable/unreliable). The emergency responders may need access to specific data about the location to properly conduct their investigations. For example, the emergency responders may require access to terrain maps, aerial view maps, utility maps, population information, and/or other information about a location. Lack of active network connection with the server may prevent the emergency responders from having access to the data at mission critical times. By obtaining the subset of resources necessary from the server and storing them in a client device, the user is able to conduct the investigation without an active network connection with the server.

The emergency responders may also need updated data about the location and/or to report back the results of the investigations. For example, emergency responders may require information about changes in weather patterns, operable access ways, and/or information gained by other emergency responders. The invention disclosed herein enables a client device to communicate with the server using a network protocol designed to allow for data transfers in locations where the network connection to the server is only periodically available or unreliable. For example, a client device may be communicating with a server via a satellite communication link which has high bandwidth but also high latency. The network protocol provides for resilient communication that enables transfer of data in locations with poor network connection. The network protocol increases the opportunity for the client device and the server to communicate properly and increases the efficiency of the data sharing.

The invention disclosed herein further enables multiple users to conduct investigations through one or more client devices acting as mini-server(s). For example, a team of emergency responders may be working on individual investigations and/or collaborating on combined investigations. One or more client devices of the emergency responders may obtain needed resources from the server and act as a mini-server to other client devices. The mini-server client device(s) provides resources to other client devices as needed, and the team of emergency responders aggregate their investigation data through the mini-server client device(s), which communicates with the server when a network connection is available.

FIG. 1 illustrates an example environment 100 for conducting investigations while having limited network connectivity to a server, in accordance with various embodiments. The example environment 100 may include a server 110, a client A 120, and a client B 130. The server 110, the client A 120, and the client B 130 may include one or more processors and memory. The processor(s) may be configured to perform various operations by interpreting machine-readable instructions stored in the memory. The server 110 may communicate with the client A 120 and/or the client B 130 via a network 170. The environment 100 may also include a data store (not shown) that is accessible to the server 110 and/or one or more of the clients 120, 130 via the network 170. In some embodiments, the data store may include various databases, application functionalities, application/data packages, and/or other data that are available for download, installation, and/or execution.

In various embodiments, the server 110 may have access to resources required by investigation applications to facilitate investigations by one or more users. The server 110 may include a database 112, functionalities 114, a resource engine 116, and a communication engine 118. The database 112 may include a structured set of data that can be divided/extracted for provision when needed by a client device (e.g., client A 120, client B 130). The data stored in the database 112 may include raw data or processed data. For example, the database 112 may include raw data of aerial view maps of various locations and may include processed data of roadways, pathways, and/or emergency routes that may be overlaid over the aerial view maps. As another example, the database 112 may include raw data of weather information and may include processed information of predicted weather patterns. The functionalities 114 may include one or more functionalities for an investigation application using a subset of data from database 112 to facilitate an investigation. Functionalities for an investigation application may include different data analysis modules that allows the investigation application to perform different data analysis tasks, patches for the investigation application, custom application/functionalities built for particular investigations, administrative tasks to be executed by client devices 120, 130 and/or different permissions for the investigation application to change/operate on the data received from the database 112.

The resource engine 116 may be configured to determine one or more resources for an investigation to be performed remotely from the server 110. The resource engine 116 may select one or more data (e.g., a subset of data from database 112 or data store) and/or one or more functionalities (a subset of functionalities from functionalities 114 or data store) for an investigation based on the investigation to be conducted, based on a user interaction with server 110, based on a user interaction with a client device (e.g., client A 120, client B 130) and/or other information. The resource engine 116 may have preset and/or previously defined sets of data/functionalities for different types of investigations, different locations of investigations, and/or different personnel involved in the investigations. The resource engine 116 may enable a user operating through a terminal (coupled with the server 110 and/or a client device 120, 130) to select particular data and/or functionalities needed for an investigation. For example, the users may select a customized data set from database 112 based on a temporal and/or a geospatial filter, which enables the users to take the most relevant information for the investigation while reducing the size of the data set taken from database 112. Taking a subset of the database 112 may increase the speed and performance of the server 110, and client devices 120, 130 during investigations.

The resource engine 116 may create one or more resource packages from the data (e.g., a subset of data from database 112 or data store) and/or functionalities (a subset of functionalities from functionalities 114 or data store) selected for an investigation. The resource packages created by the resource engine 116 may include database/data analytics ontologies that may be used by the client devices 120, 130 during investigations. The resource engine 116 may include one or more updated data/functionalities in a resource package. For example, the resource engine 116 may have created an initial payload for the client A 120 to include a map of a region and/or information associated with the region. The map included in the resource package may be changed at a later time. For example, details may be added/removed from the map and/or one or more conditions (weather conditions) included with the map may change over time. Rather than including a new map with new information in the resource package, the resource engine 116 may include changes to the map in the resource package so that the client A 120 can locally incorporate the changes into the map. Including updates to previously sent data/functionalities, rather than including new data/functionalities, may reduce the size of the resource package to be sent to the client A 120. In some embodiments, the resource engine 116 may enable offline syncing (storage and transfer of resource packages via physical media) between the server 110 and client devices 120, 130.

In various embodiments, the server 110 and/or the client devices 120, 130 may allow for user-management of the data selected for an investigation. For example, data selected for an investigation may include a map cache (a collection of map tiles) of the location at which the investigation will be conducted. Users may use the server 110 and/or the client devices 120, 130 to manually create map caches of the relevant location before deployment so that the data about the location is stored locally within the client devices 120, 130. By storing the map tiles locally within the client devices 120, 130, a user may use the client devices 120, 130 to view the maps with little or no connection with the server 110. The users may change the map caches during the investigation by including more, less, and/or different information within the map caches.

The users may define one or more parameters of the map cache. The users may define the location(s) for which the map cache will be defined. The users may define the levels/types of details to be included in the map cache. For example, the users may define the zoom level of the maps and/or the types of information (e.g., information about roads, terrain, population) included in the maps. Individual map tiles may be associated with particular details. Different maps tiles may be associated with different zoom level and/or types of information so that the individual map tiles include the most relevant information and does not include unnecessarily information. For example, an emergency responder may wish to have emergency pathway information for a larger area of the investigation location while having utility access information for particular buildings. By restricting the utility access information to particular buildings (instead of all buildings in the investigation area), the size of the map cache may be reduced, enabling quicker transfer time between the server 110 and the client devices 120, 130. In some embodiments, the data selected for an investigation (e.g., map caches) may be stored at server 110 for reuse. In some embodiments, the data selected for an investigation may not be stored—for example, a one-time map cache may be created for inclusion in a resource package.

The communication engine 118 may be configured to send one or more resources for an investigation to a client device (e.g., the client A 120, the client B 130). The communication engine 118 may be configured to send one or more updates for one or more resources to a client device. The communication engine 118 may be configured to receive one or more results of an investigation from a client device. For example, the communication engine 118 may send resources and/or updates to resources to the client A 120 and/or the client B 130 by sending one or more resource packages discussed above. The communication engine 118 may send and/or receive data from a client device when the client device syncs with the server. For example, the server 110 may include one or more resource packages containing new map caches, updated map caches, software updates/patches, and/or other information for a client device. When the client device devices connect with the server 110 for a data sync, the communication engine 118 may send the resource package(s) to the client device for installation/use.

The communication engine 118 may receive results of an investigation from the client A 120 and/or the client B 130 and incorporate the results into the database 112. For example, the communication engine 118 may receive and incorporate changes to data stored in the database 112 and/or may receive and incorporate new records for inclusion in the database 112. In some embodiments, the communication engine 118 may receive operating information about the client devices (e.g., operation logs), which enables users of the server 110 to assist in solving issues with the client devices (e.g., writing/fixing mission-specific tools).

In some embodiments, the communication engine 118 may record full lineage and history of data as different users make changes to the data in the database 112 (e.g., via interaction with the data subset A-1 222A and/or the data subset A-2 222B). In some embodiments, the communication engine 118 may hide one or more lineage and/or history information when sharing the results of the investigation. For example, the communication engine 118 may utilize vector clocks to keep track of changes being made to data/objects stored in the database 112 (e.g., via interaction with the data subset A-1 222A and/or the data subset A-2 222B). The amount of data required to represent the vector clock may become very large/unwieldy as the number of client device served by server 110 (directly by server 110 and/or indirectly through another client device) increases. For example, the server 110 may have more than two dozen client devices serving as mini-servers, with each mini-servers serving hundreds of other client devices. The amount of data required to represent the changes made by individual client devices may be very large, which may slow down the transfer of data between the server 110 and the mini-servers and/or between the server 110 and other servers.

The server 110 may decrease the size of the vector clock information by hiding/excluding information about which client device made the particular change when sharing the vector clock information. This may result in the vector clock indicating that any changes made by client devices served by the server 110 (directly or indirectly) as being made by the server 110. Such process may be referred to as vector clock flattening. Vector clock flattening may effectively hide the individual client devices served by the server 110 behind the server 110. Vector clock flattening may enable servers to keeping track of and share changes in data based on a per-server basis rather than a per-client device basis. By using vector clock flattening, the server 110 may reduce the amount of data/time required to update other devices (e.g., servers, client devices) regarding changes to the data. The vector clock flattening may not be applied to changes for which the lineage/history information must be preserved.

In some embodiments, the communication engine 118 may utilize vector clock flattening during an import operation and/or an export operation. During an import operation (importing at the server 110 from the client devices 120, 130), for each incoming object, the server 110 may perform happens-after/concurrency checks with the full clock information, and either apply the objects or put them in pending. For each happens-after objects, the server 110 may create a local data event (to bump the clock), remove the client device-part of the clock (the server 110 may record this information in another location) and store the new non-client device clock. When deconflicting, the server 110 may perform a similar update to the clock without an extra data event bump (except in a value-equals deconfliction).

During an export operation (exporting from the server 110 to the client devices 120, 130), the server 110 may re-add the client-device part of the clock when exporting to the client devices 110, 120. This may avoid constant deconfliction. To determine which part of the client-device part to re-add, the server 110 may use a table that maps the local data event at which an object was imported to the part of the clock to re-add.

The communication engine 118 may implement a network protocol designed to allow for data transfers in locations where the network connection to the server is only periodically available or unreliable. In some implementations, the network protocol may enable the communication engine 118 to reroute communications between the server 110 and the client devices 120, 130. In some implementations, the communication engine 118 may provide for priority in communications (e.g., certain data/client devices are provided with higher priority for communication than other data/client devices).

The network protocol may make a number of assumption about the network connection. The assumptions about the network connection may include: (1) the server 110 and the client devices 120, 130 may have a network connection; (2) the network connection between the server 110 and the client devices 120, 130 may drop during transmission of data; (3) the data transmission between the server 110 and the client devices 120, 130 may resume—allows for resumption of partial data transfer. The network protocol may enable the devices (e.g., servers, client devices) to share data when connection becomes available (e.g., during syncing of data), rather than communicating on a periodic basis.

The network protocol implemented by the communication engine 118 may include a number of network connection settings designed to provide resilient communication that enables transfer of data in locations with poor network connection. The communication engine 118 may allow for user management of the network connection settings to fine-tune the connection between the server 110 and the client devices 120, 130. The network connection settings for the network protocol may include (1) connection timeout, (2) socket timeout, (3) retries, (4) retry interval, and (5) chunk size.

The connection timeout setting determines the time allotted to the client devices 120, 130 to initialize a new connection with the server 110. The default time allotted for connection timeout may include sixty seconds. The connection attempt will timeout if the client devices 120, 130 cannot communicate with the server 110 within the allotted time period. This may occur if the network connection between the server 110 and the client devices 120, 130 have dropped out completely or if the network connection is too slow. A high value for the connection timeout may cause overall communication failures to take a longer time to be reported.

The socket timeout setting determines the maximum amount of time an established connection between the client devices 120, 130 and the server 110 can remain “alive” without receiving or sending any data. The default time allotted for socket timeout may include sixty seconds. If the connection between the client devices 120, 130 and the server 110 drops during a data transfer, the client devices 120, 130 will wait for the time of the socket timeout before closing the connection and retrying.

The retry setting determines the number of times the client devices 120, 130 will attempt to connect to the server 110 before giving up. The retry counter may be initialized whenever there is an operation that requires connecting and transferring data to/from the server 110. The default value for the retry setting may be ten. On a slow or intermittent network that timeouts or drops connections frequently, the retry value may be increased to ensure complete data transfer. Upon a data transfer failure, the retry counter is incremented and the client devices 120, 130 may attempt to resume the transfer from the last successful point (attempting to resume partial data transfer) using sync markers. Sync markers may be set based on file size, and the server 110 and the client devices 120, 130 may send sync markers back and forth to indicate how much of the data was successfully sent. The data transmission may be accompanied by use of checksum to confirm the integrity of the received files.

The retry interval controls the amount of time to wait between retry attempts between the server 110 and the client devices 120, 130. The retry interval uses an exponential back-off technique to avoid flooding a congested network when connections are failing. When a connection or transfer attempt fails and a retry is attempted, an ATTEMPT_COUNTER value is incremented and the retry is held off for a wait amount given by: min(MAX_RETRY_INTERVAL, SERVER_RETRY_INTERVAL*(1.5{circumflex over ( )}ATTEMPT_COUNTER)). MAX_RETRY_INTERVAL may define the maximum duration of the retry interval. SERVER_RETRY_INTERVAL may define the retry internal defined for a particular server. For example, the wait amounts for 10 retries, where the SERVER_RETRY_INTERVAL=0.1 second and MAX_RETRY_INTERVAL=5.0 second, are (in seconds): 0.15; 0.23; 0.34; 0.51; 0.76; 1.14; 1.71; 2.56; 3.84; 5.0. As another example, the wait amounts for 10 retries, where the SERVER_RETRY_INTERVAL=1.0 second and MAX_RETRY_INTERVAL=20.0 seconds, are (in seconds): 1.5; 2.25; 3.38; 5.06; 7.60; 11.39; 17.09; 20.0; 20.0; 20.0.

In some embodiments, the communication engine 118 may enable a user to change one or more network connection settings based on the current/expected network connection quality. For example, the optimal network connection settings may be different when operating in a strong, stable network connection environment versus when operating in a weak, unstable network connection environment. In some embodiments, the communication engine 118 may detect the quality of the network connection environment in which the devices are operating and switch between different profiles of the network connection settings based on the detected quality of the network connection environment.

When the communication engine 118 determines that a connection between the server 110 and the client devices 120, 130 is reestablished, the information (e.g., resources, updates) created while the devices were disconnected are packaged and sent to the client devices 120, 130. This process ensures that the users of the client devices 120, 130 are provided with the up-to-date information for their investigations.

In various embodiments, the client A 120 may include a data subset A-1 122A, a data subset A-2 122B, and a communication engine A 128. The client A 120 may include a data analysis platform that enables a user to utilize resources obtained from server 110 to conduct one or more investigations. The user may use an investigation application (e.g., a web application) that exposes the data obtained from the server 110 and locally stored at the client A 120 to conduct the investigations and provide inputs into the data/investigation. The use of the data obtained from the server 110 and locally stored at the client A 120 may enable one or users to conduct investigations without having an active network connection with the server 110. In some embodiments, the investigation application may be executed at the client A 120 (e.g., a user uses a web application from the client A 120 to conduct the investigation). In some embodiments, the investigation application may be executed at a client device served by the client A 120 (e.g., a user uses a web application from another client device to access the resources stored at the client A 120 and conduct the investigation). In some embodiments, the client A 120 may communicate with different servers as needed when changing locations.

The inputs provided by the users using the client A 120 may be synced back to the server 110. The users may use the investigation application to change the received data and/or make new records to be sent to the server 110 for incorporation into the database 112. In some embodiments, the scope of the use of the data by the users may be limited based on the types of users. For example, certain users may be provided with the capability to use the client A 120 to view the data received from the server 110. These users may not be provided with the capability to use the client A 120 to make change to the data or enter new records. Other users may be provided with the capability to use the client A 120 to make changes to the data received from the server 110 and/or make new records for incorporation into the database 112.

The communication engine A 128 may be configured to receive one or more resources (e.g., the data subset A-1 122A, the data subset A-2 122B) for an investigation from the server 110. The communication engine A 128 may be configured to receive one or more updates for one or more resources from the server 110. The communication engine A 128 may be configured to send one or more results of an investigation to the server 110. The results of an investigation may be sent during the investigation and/or after the investigation. For example, the communication engine A 128 may receive resources and/or updates to resources from the server 110 by receiving one or more resource packages discussed above.

The communication engine A 128 may send results of an investigation to the server 110, which may then be incorporated into the database 112. For example, the communication engine A 128 may send changes for incorporation into the database 112 and/or new records for inclusion in the database 112. In some embodiments, the communications engine A 128 may send operating information about the client A 120 (e.g., operation logs), which may enable users of the server 110 to assist in solving issues with the client A 120 (e.g., writing/fixing mission-specific tools).

In some embodiments, the results of the investigation may be packaged in a periodic basis so that they are ready to be sent to the server 110 when a connection is established. In some embodiments, the results of the investigation may be packaged when a connection with the server 110 is detected. In some embodiments, the results of the investigation may be packaged based on a user command received at the client A 120 (e.g., through a user terminal coupled to client A 120 or a command to sync received from the server 110).

In some embodiments, the communication engine A 128 may hide one or more lineage and/or history information when sending the results of the investigation to the server 110. In some implementations, the communication engine A 128 may use vector clock flattening described above.

The communication engine A 128 may implement the network protocol described above to allow for data transfers in locations where the network connection to the server is only periodically available or unreliable. The communication engine A 128 may enable a user of client A 120 to change one or more network connection settings. The communication engine A 128 may enable a user of the client A 120 to change one or more of (1) connection timeout, (2) socket timeout, (3) retries, (4) retry interval, and (5) chunk size.

The data subset A-1 122A and the data subset A-2 122B may include one or more data needed for a user to conduct an investigation using the client A 120. The data subset A-1 122A and the data subset A-2 122B may include a subset of the database 112. The data subset A-1 122A and the data subset A-2 122B may include one or more of the same data from the database 112 and/or may include one or more of different data from the database 112. The data subset A-1 122A and the data subset A-2 122B may be used for the same investigation or for different investigations. The user may use the investigation application executed at the client A 120 to expose the data subset A-1 122A and/or the data subset A-2 122B. The user may user the investigation application executed at the client A 120 to conduct the investigation and provide inputs to the data/investigation without having an active network connection with the server 110.

In various embodiments, the client B 130 may include a data subset B-1 132, a functionality subset B-1 134, and a communication engine B 138. The client B 130 may include a data analysis platform that enables a user to utilize data obtained from server 110 to conduct one or more investigations. The user may use an investigation application (e.g., a web application) that exposes the data obtained from the server 110 and locally stored at the client B 130 to conduct the investigations and provide inputs into the data/investigation. The use of the data obtained from the server 110 and locally stored at the client B 130 may enable one or users to conduct investigations without having an active network connection with the server 110. In some embodiments, the investigation application may be executed at the client B 130 (e.g., a user uses a web application from the client B 130 to conduct the investigation). In some embodiments, the client B 130 may communicate with different servers as needed when changing locations.

The inputs provided by the users using the client B 130 may be synced back to the server 110. The users may use the investigation application to change the received data and/or make new records to be sent to the server 110 for incorporation into the database 112. In some embodiments, the scope of the use of the data by the users may be limited based on the types of users. For example, certain users may be provided with the capability to use the client B 130 to view the data received from the server 110. These users may not be provided with the capability to use the client B 130 to make change to the data or enter new records. Other users may be provided with the capability to use the client B 130 to make changes to the data received from the server 110 and/or make new records for incorporation into the database 112.

The communication engine B 138 may be configured to receive one or more resources (e.g., the data subset B-1 132, the functionality subset B-1 134) for an investigation from the server 110. The communication engine B 138 may be configured to receive one or more updates for one or more resources from the server 110. The communication engine B 138 may be configured to send one or more results of an investigation to the server 110. The communication engine B 138 may be configured to implement some, or all, of the functionalities of the communication engine A 128 as described above.

The data subset B-1 132 may include one or more data needed for a user to conduct an investigation using client B 130. The data subset B-1 132 may include a subset of the database 112. The user may use the investigation application executed at the client B 130 to expose the data subset B-1 132. The user may user the investigation application executed at the client B 130 to conduct the investigation and provide inputs to the data/investigation without having an active network connection with the server 110.

The functionality subset B-1 124 may include one or more functionalities for the investigation application using the data subset B-1 132. The functionality subset B-1 124 may include a subset of data analysis module, patches for the investigation application, custom applications/functionalities built for investigations, and/or permissions for the investigation application executed on the client B 130 and/or served by the client B 130 to change/operate on the data subset B-1 132.

For example, functionality subset B-1 134 may allow certain users (e.g., administrators) to create and run administrative tasks on the client B 130. As non-limiting example, administrative tasks may be run to collect diagnostics about the client B 130 to diagnose a problem with the client B 130, to fix or change a state that caused an issue at the client B 130 (such as an emergency configuration change), and/or to deploy emergency software updates for investigation applications or other components of the client B 130. In some embodiments, administrative tasks may be executed as a part of the normal payload received from the server 110 (e.g., as part of receiving resource packages/updates to resource package). In some embodiments, the administrative tasks may be executed by the client B after application of any pending patches but before data import. The results of the administrative tasks may be collected and saved on the client B 130. The results of the administrative tasks may be sent to the server 110 at the end of the administrative task or as part of another payload to the server 110. For example, the client B 130 may send to the server 110 the results of the administrative tasks along with the results of an investigation. The results of the administrative task may include a log, output files, metadata indicating operating of the administrative task, and/or other information.

FIG. 2 illustrates an example environment 200 for conducting investigations while having limited network connectivity to a server, in accordance with various embodiments. The example environment 200 may include a client A 220, a client B 230, a client C 240, a client D 250, and a client E 260. The client A 220, the client B 230, the client C 240, the client D 250, and the client E 260 may include one or more processors and memory. The processor(s) may be configured to perform various operations by interpreting machine-readable instructions stored in the memory. In some embodiments, the client A 220 may be configured to implement some, or all, of the functionalities of the client A 120 as described above. Similarly, in some embodiments, the client B 230 may be configured to implement some, or all, of the functionalities of the client B 130 as described above. The client A 220, the client B 230, the client C 240, the client D 250, and the client E 260 may not have an active connection with a server (“base server”) from which the clients 220, 230, 240, 250, 260 may receive resources necessary to conduct one or more investigations.

Prior to the example environment 200 shown in FIG. 2, the client A 220 may have received resources necessary to conduct one or more investigations (e.g., data subset A-1 222A, data subset A-2 222B) from a base server as described above with respect to the data subset A-1 122A, the data subset A-2 122B. In some embodiments, the communication engine A 228 may be configured to implement some, or all, of the functionalities of the communication engine A 128 as described above.

The communication engine A 228 may be configured to serve one or more resources from the data subset A-1 222A and/or the data subset A-2 222B to the client C 240 and/or the client D 250. The communication engine A 228 may be configured to receive one or more results of investigations from client C 240 and/or client D 250. The communication engine A 228 may be configured to provide one or more results of investigation received from the client C 240 and/or the client D 250 to another server (e.g., the base server).

The communication engine A 228 may enable the client A 220 to act as a server (“mini-server”) for the resources contained in the data subset A-1 222A and/or the data subset A-2 222B. The communication engine A 228 may enable multiple users operating the client C 240 and the client D 250 to collaborate on the same data set (the data subset A-1 222A or the data subset A-2 222B) and/or work on independent investigations using separate data sets (the data subset A-1 222A and the data subset A-2 222B). For example, users using the client C 240 and the client D 250 may launch investigation applications using the client C 240 and the client D 250, respectively. The investigation applications may use the same or different map caches stored in the data subset A-1 222A and/or the data subset A-2 222B. In some embodiments, the communication engine A 228 may hide one or more lineage and/or history information when sending the results of the investigation to the base server. In some implementations, the communication engine A 228 may use vector clock flattening described above.

Referring to the client B 230 in FIG. 2, the client B 230 may have received resources necessary to conduct one or more investigations (e.g., the data subset B-1 232, the functionality subset B-1 234) from a base server as described above with respect to the data subset B-1 132, the functionality subset B-1 134. In some embodiments, the communication engine B 238 may be configured to implement some, or all, of the functionalities of the communication engine B 138 as described above.

The communication engine B 238 may be configured to serve one or more resources from the data subset B-1 232, the functionality subset B-1 234 to client E 260. The communication engine A 228 may be configured to receive one or more results of investigations from the client E 260. The communication engine B 238 may be configured to provide one or more results of investigation received from client E 260 to another server (e.g., the base server).

The communication engine B 238 may enable client B 230 to act as a mini-server for the resources contained the data subset B-1 234 and/or the functionality subset B-1 234. In some implementations, the communication engine B 238 may record full lineage and history of data as different users make changes to the data in data subset B-1 234. In some embodiments, the communication engine B 238 may hide one or more lineage and/or history information when sending the results of the investigation to the base server. In some implementations, the communication engine B 238 may use vector clock flattening described above.

The client C 240 may include the communication engine C 248. The communication engine C 248 may enable the client C 240 to communicate with the client A 220 as described above. The client D 250 may include the communication engine D 258. The communication engine D 258 may enable the client D 250 to communicate with the client A 220 as described above. The client E 260 may include the communication engine 268. The communication engine 268 may enable the client E 260 to communicate with the client B 230 as described above.

FIG. 3 illustrates an example environment 300 for conducting investigations while having limited network connectivity to a server, in accordance with various embodiments. The example environment 300 may include a client A 320, a client B 330, a client C 340, a client D 350, and a client E 360. The client A 320, the client B 330, the client C 340, the client D 350, and the client E 360 may include one or more processors and memory. The processor(s) may be configured to perform various operations by interpreting machine-readable instructions stored in the memory. In some embodiments, the client A 320 may be configured to implement some, or all, of the functionalities of the client A 120, 220 as described above. In some embodiments, the client B 330 may be configured to implement some, or all, of the functionalities of the client B 130, 230 as described above. In some embodiments, the client C 340, the client D 350, and the client E 360 may be configured to implement some, or all, of the functionalities of the client C 240, the client D 250, and the client E 260 as described above.

The client A 320, the client B 330, the client C 340, the client D 350, and the client E 360 may not have an active connection with a server (“base server”) from which the clients 320, 330, 340, 350, 360 may receive resources necessary to conduct one or more investigations.

Prior to the example environment 300 shown in FIG. 3, the client A 320 may have received resources necessary to conduct one or more investigations (e.g., data subset A-1 322A, data subset A-2 322B) from a base server as described above with respect to the data subset A-1 122A, 222A, the data subset A-2 122B, 222B. In some embodiments, the communication engine A 328 may be configured to implement some, or all, of the functionalities of the communication engine A 128, 228 as described above. The client B 330 may have received resources necessary to conduct one or more investigations (e.g., the data subset B-1 332, the functionality subset B-1 334) from a base server as described above with respect to the data subset B-1 132, 232, the functionality subset B-1 134, 234. In some embodiments, the communication engine B 338 may be configured to implement some, or all, of the functionalities of the communication engine B 138, 238 as described above.

The client C 340 may include the communication engine C 348. The communication engine C 348 may enable the client C 340 to communicate with the client A 320 as described above. The client D 350 may include the communication engine D 358. The communication engine D 358 may enable the client D 350 to communicate with the client A 320 as described above. The client E 360 may include the communication engine 368. The communication engine 368 may enable the client E 360 to communicate with the client B 330 as described above.

In some embodiments, the ability of a mini-server (e.g., the client A 320, the client B 330) to provide resources locally stored within the mini-server to other client devices may be limited. For example, referring to FIG. 3, the client A 320 may be restricted from providing one or more resources contained in the data subset A-1 322A and/or the data subset A-2 322B to client devices other than the client C 340 or the client D 350. Restricting the devices to which a mini-server may provide resources for investigation may enable users to manage where the resources may be accessed and/or changed.

As another example, the client B 330 may be restricted from providing permanent copies of one or more resources contained in the data subset B-1 332 and/or the functionality subset B-1 334 to other client devices. The client B 330 may provide temporary copies of one or more resources contained in the data subset B-1 332 and/or the functionality subset B-1 334 to the client A 320, the client C 340, the client D 350, and/or the client E 360, allowing the client A 320, the client C 340, the client D 350, and/or the client E 360 to view and make changes to the resources during an active instance of the investigation application. The temporary copies of the resources provided by the client B 330 may be deleted after the users close the active instance of the investigation application or terminate connection with the client B 330. Restricting the client devices from receiving permanent copies of the resources may enable users to manage where the resources are stored and prevent wide/uncontrolled dissemination of the resources.

FIG. 4 illustrates an example interface 400 for determining one or more resources for an investigation, in accordance with various embodiments. A user may use the interface 400 from a terminal (coupled with a base server, a mini-serer, or a client device) to select particular data and/or functionalities needed for an investigation. The interface 400 may include a name field 402, a description field 404, an information box 406, resources display 408, and sources to add box 416. A user may insert a name for a resource using the name field 402. A user may insert a description for a resource using the description field 404. The information box 406 may provide information about the selected resource. For example, as shown in FIG. 4, the information box 406 may provide information about the level of detail included in the selected resource and the estimated size of the selected resource.

The resources display 408 may display the selected resource. For example, as shown in FIG. 4, the resources display 408 may display a map from which a user may select the location to be included in the resource (e.g., map cache). The zoom level of the map displayed in the resources display 408 may be changed via interactions with options 410. A user may select the location to be included in the map cache by using one or more of options 412, 414. The option 412 may enable a user to select a shape to be overlaid of the map displayed in the resources display 408. For example, a user may select one or more of a hexagon, a square, a circle, and/or other shapes to be overlaid over the map. The size of the shape may be increased or decreased to cover different areas of the map. One or more shapes may be changed/distorted to cover different areas of the map. The areas inside the shape(s) may be included within the map cache. As another example, a user may select option 414 to draw one or more regions within the map. The areas inside the drawn shape(s) may be included within the map cache.

The sources to add box 416 may provide users with additional options for the type of information included within the map cache. For example, a user may use options 418 to determine what types of views (e.g., aerial view, terrain view) are included within the map cache. Option 420 may enable a user to determine the level of detail to be included within the map cache. For example, in FIG. 4, the user may have selected a detail level of “2,” which includes more detail than the detail level of “1,” but less details than the detail levels of “3” to “10” for the terrain view. Option 422 may enable a user to select a specific type of information to be include within the map cache. For example, the user may be provided with the options 424 to include different details about within the relevant location. Options 426 may enable a user to select a particular area (e.g., area A, area B) to be included within the map cache. The particular areas may be predefined areas or areas previously selected/defined by the user. The sources to add box 416 may include a date range selector by which a user may define the dates from which the information for the selected areas may be populated. The user may use the date range selector to define the dates of all information contained within the map cache or may use the date range selector to define different dates for different information contained within the map cache. For example, the user may use the date range selector to search and pull reports about a particular area published within a selected dates range. The user may use option 428 to create a map cache from the selected options.

The map tiles and additional information contained with map caches may be updated after the map caches have been provided to mini-servers. For example, a map cache may include aerial views of a building. After the map cache has been provided to a mini-server, the base server may be updated with more recent aerial views of the building. During a syncing session between the mini-server and the base server (e.g., during a data sync), the mini-server may receive from the base server newer aerial views of the building. In some embodiments, the users of the investigation applications that rely on the mini-server for information on the building may be provided with a message that an updated aerial views of the building is available.

FIG. 5 illustrates a flowchart of an example method 500, according to various embodiments of the present disclosure. The method 500 may be implemented in various environments including, for example, the environment 100 of FIG. 1. The operations of method 500 presented below are intended to be illustrative. Depending on the implementation, the example method 500 may include additional, fewer, or alternative steps performed in various orders or in parallel. The example method 500 may be implemented in various computing systems or devices including one or more processors.

At block 502A, one or more resources for an investigation to be performed remotely from a server may be received from the server. At block 502B, one or more updates for resource(s) for the investigation may be received from the server. At block 504, one or more resources may be provided to an investigation application that facilitates the investigation. One or more provided resources may enable the investigation application to facilitate the investigation without an active connection to the server. At block 506A, the investigation application may be executed and a result of the investigation may be obtained from the investigation application. At block 506B, a result of the investigation may be obtained from a remotely executed investigation application. At block 508, the result of the investigation may be sent to the server.

Hardware Implementation

The techniques described herein are implemented by one or more special-purpose computing devices. The special-purpose computing devices may be hard-wired to perform the techniques, or may include circuitry or digital electronic devices such as one or more application-specific integrated circuits (ASICs) or field programmable gate arrays (FPGAs) that are persistently programmed to perform the techniques, or may include one or more hardware processors programmed to perform the techniques pursuant to program instructions in firmware, memory, other storage, or a combination. Such special-purpose computing devices may also combine custom hard-wired logic, ASICs, or FPGAs with custom programming to accomplish the techniques. The special-purpose computing devices may be desktop computer systems, server computer systems, portable computer systems, handheld devices, networking devices or any other device or combination of devices that incorporate hard-wired and/or program logic to implement the techniques.

Computing device(s) are generally controlled and coordinated by operating system software, such as iOS, Android, Chrome OS, Windows XP, Windows Vista, Windows 7, Windows 8, Windows Server, Windows CE, Unix, Linux, SunOS, Solaris, iOS, Blackberry OS, VxWorks, or other compatible operating systems. In other embodiments, the computing device may be controlled by a proprietary operating system. Conventional operating systems control and schedule computer processes for execution, perform memory management, provide file system, networking, I/O services, and provide a user interface functionality, such as a graphical user interface (“GUI”), among other things.

FIG. 6 is a block diagram that illustrates a computer system 600 upon which any of the embodiments described herein may be implemented. The computer system 600 includes a bus 602 or other communication mechanism for communicating information, one or more hardware processors 604 coupled with bus 602 for processing information. Hardware processor(s) 604 may be, for example, one or more general purpose microprocessors.

The computer system 600 also includes a main memory 606, such as a random access memory (RAM), cache and/or other dynamic storage devices, coupled to bus 602 for storing information and instructions to be executed by processor 604. Main memory 606 also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by processor 604. Such instructions, when stored in storage media accessible to processor 604, render computer system 600 into a special-purpose machine that is customized to perform the operations specified in the instructions.

The computer system 600 further includes a read only memory (ROM) 608 or other static storage device coupled to bus 602 for storing static information and instructions for processor 604. A storage device 610, such as a magnetic disk, optical disk, or USB thumb drive (Flash drive), etc., is provided and coupled to bus 602 for storing information and instructions.

The computer system 600 may be coupled via bus 602 to a display 612, such as a cathode ray tube (CRT) or LCD display (or touch screen), for displaying information to a computer user. An input device 614, including alphanumeric and other keys, is coupled to bus 602 for communicating information and command selections to processor 604. Another type of user input device is cursor control 616, such as a mouse, a trackball, or cursor direction keys for communicating direction information and command selections to processor 604 and for controlling cursor movement on display 612. This input device typically has two degrees of freedom in two axes, a first axis (e.g., x) and a second axis (e.g., y), that allows the device to specify positions in a plane. In some embodiments, the same direction information and command selections as cursor control may be implemented via receiving touches on a touch screen without a cursor.

The computing system 600 may include a user interface module to implement a GUI that may be stored in a mass storage device as executable software codes that are executed by the computing device(s). This and other modules may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.

In general, the word “module,” as used herein, refers to logic embodied in hardware or firmware, or to a collection of software instructions, possibly having entry and exit points, written in a programming language, such as, for example, Java, C or C++. A software module may be compiled and linked into an executable program, installed in a dynamic link library, or may be written in an interpreted programming language such as, for example, BASIC, Perl, or Python. It will be appreciated that software modules may be callable from other modules or from themselves, and/or may be invoked in response to detected events or interrupts. Software modules configured for execution on computing devices may be provided on a computer readable medium, such as a compact disc, digital video disc, flash drive, magnetic disc, or any other tangible medium, or as a digital download (and may be originally stored in a compressed or installable format that requires installation, decompression or decryption prior to execution). Such software code may be stored, partially or fully, on a memory device of the executing computing device, for execution by the computing device. Software instructions may be embedded in firmware, such as an EPROM. It will be further appreciated that hardware modules may be comprised of connected logic units, such as gates and flip-flops, and/or may be comprised of programmable units, such as programmable gate arrays or processors. The modules or computing device functionality described herein are preferably implemented as software modules, but may be represented in hardware or firmware. Generally, the modules described herein refer to logical modules that may be combined with other modules or divided into sub-modules despite their physical organization or storage.

The computer system 600 may implement the techniques described herein using customized hard-wired logic, one or more ASICs or FPGAs, firmware and/or program logic which in combination with the computer system causes or programs computer system 600 to be a special-purpose machine. According to one embodiment, the techniques herein are performed by computer system 600 in response to processor(s) 604 executing one or more sequences of one or more instructions contained in main memory 606. Such instructions may be read into main memory 606 from another storage medium, such as storage device 610. Execution of the sequences of instructions contained in main memory 606 causes processor(s) 604 to perform the process steps described herein. In alternative embodiments, hard-wired circuitry may be used in place of or in combination with software instructions.

The term “non-transitory media,” and similar terms, as used herein refers to any media that store data and/or instructions that cause a machine to operate in a specific fashion. Such non-transitory media may comprise non-volatile media and/or volatile media. Non-volatile media includes, for example, optical or magnetic disks, such as storage device 610. Volatile media includes dynamic memory, such as main memory 606. Common forms of non-transitory media include, for example, a floppy disk, a flexible disk, hard disk, solid state drive, magnetic tape, or any other magnetic data storage medium, a CD-ROM, any other optical data storage medium, any physical medium with patterns of holes, a RAM, a PROM, and EPROM, a FLASH-EPROM, NVRAM, any other memory chip or cartridge, and networked versions of the same.

Non-transitory media is distinct from but may be used in conjunction with transmission media. Transmission media participates in transferring information between non-transitory media. For example, transmission media includes coaxial cables, copper wire and fiber optics, including the wires that comprise bus 602. Transmission media can also take the form of acoustic or light waves, such as those generated during radio-wave and infra-red data communications.

Various forms of media may be involved in carrying one or more sequences of one or more instructions to processor 604 for execution. For example, the instructions may initially be carried on a magnetic disk or solid state drive of a remote computer. The remote computer can load the instructions into its dynamic memory and send the instructions over a telephone line using a modem. A modem local to computer system 600 can receive the data on the telephone line and use an infra-red transmitter to convert the data to an infra-red signal. An infra-red detector can receive the data carried in the infra-red signal and appropriate circuitry can place the data on bus 602. Bus 602 carries the data to main memory 606, from which processor 604 retrieves and executes the instructions. The instructions received by main memory 606 may retrieves and executes the instructions. The instructions received by main memory 606 may optionally be stored on storage device 610 either before or after execution by processor 604.

The computer system 600 also includes a communication interface 618 coupled to bus 602. Communication interface 618 provides a two-way data communication coupling to one or more network links that are connected to one or more local networks. For example, communication interface 618 may be an integrated services digital network (ISDN) card, cable modem, satellite modem, or a modem to provide a data communication connection to a corresponding type of telephone line. As another example, communication interface 618 may be a local area network (LAN) card to provide a data communication connection to a compatible LAN (or WAN component to communicated with a WAN). Wireless links may also be implemented. In any such implementation, communication interface 618 sends and receives electrical, electromagnetic or optical signals that carry digital data streams representing various types of information.

A network link typically provides data communication through one or more networks to other data devices. For example, a network link may provide a connection through local network to a host computer or to data equipment operated by an Internet Service Provider (ISP). The ISP in turn provides data communication services through the world wide packet data communication network now commonly referred to as the “Internet”. Local network and Internet both use electrical, electromagnetic or optical signals that carry digital data streams. The signals through the various networks and the signals on network link and through communication interface 618, which carry the digital data to and from computer system 600, are example forms of transmission media.

The computer system 600 can send messages and receive data, including program code, through the network(s), network link and communication interface 618. In the Internet example, a server might transmit a requested code for an application program through the Internet, the ISP, the local network and the communication interface 618.

The received code may be executed by processor 604 as it is received, and/or stored in storage device 610, or other non-volatile storage for later execution.

Each of the processes, methods, and algorithms described in the preceding sections may be embodied in, and fully or partially automated by, code modules executed by one or more computer systems or computer processors comprising computer hardware. The processes and algorithms may be implemented partially or wholly in application-specific circuitry.

The various features and processes described above may be used independently of one another, or may be combined in various ways. All possible combinations and sub-combinations are intended to fall within the scope of this disclosure. In addition, certain method or process blocks may be omitted in some implementations. The methods and processes described herein are also not limited to any particular sequence, and the blocks or states relating thereto can be performed in other sequences that are appropriate. For example, described blocks or states may be performed in an order other than that specifically disclosed, or multiple blocks or states may be combined in a single block or state. The example blocks or states may be performed in serial, in parallel, or in some other manner. Blocks or states may be added to or removed from the disclosed example embodiments. The example systems and components described herein may be configured differently than described. For example, elements may be added to, removed from, or rearranged compared to the disclosed example embodiments.

Conditional language, such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular embodiment.

Any process descriptions, elements, or blocks in the flow diagrams described herein and/or depicted in the attached figures should be understood as potentially representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process. Alternate implementations are included within the scope of the embodiments described herein in which elements or functions may be deleted, executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those skilled in the art.

It should be emphasized that many variations and modifications may be made to the above-described embodiments, the elements of which are to be understood as being among other acceptable examples. All such modifications and variations are intended to be included herein within the scope of this disclosure. The foregoing description details certain embodiments of the invention. It will be appreciated, however, that no matter how detailed the foregoing appears in text, the invention can be practiced in many ways. As is also stated above, it should be noted that the use of particular terminology when describing certain features or aspects of the invention should not be taken to imply that the terminology is being re-defined herein to be restricted to including any specific characteristics of the features or aspects of the invention with which that terminology is associated. The scope of the invention should therefore be construed in accordance with the appended claims and any equivalents thereof.

Engines, Components, and Logic

Certain embodiments are described herein as including logic or a number of components, engines, or mechanisms. Engines may constitute either software engines (e.g., code embodied on a machine-readable medium) or hardware engines. A “hardware engine” is a tangible unit capable of performing certain operations and may be configured or arranged in a certain physical manner. In various example embodiments, one or more computer systems (e.g., a standalone computer system, a client computer system, or a server computer system) or one or more hardware engines of a computer system (e.g., a processor or a group of processors) may be configured by software (e.g., an application or application portion) as a hardware engine that operates to perform certain operations as described herein.

In some embodiments, a hardware engine may be implemented mechanically, electronically, or any suitable combination thereof. For example, a hardware engine may include dedicated circuitry or logic that is permanently configured to perform certain operations. For example, a hardware engine may be a special-purpose processor, such as a Field-Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC). A hardware engine may also include programmable logic or circuitry that is temporarily configured by software to perform certain operations. For example, a hardware engine may include software executed by a general-purpose processor or other programmable processor. Once configured by such software, hardware engines become specific machines (or specific components of a machine) uniquely tailored to perform the configured functions and are no longer general-purpose processors. It will be appreciated that the decision to implement a hardware engine mechanically, in dedicated and permanently configured circuitry, or in temporarily configured circuitry (e.g., configured by software) may be driven by cost and time considerations.

Accordingly, the phrase “hardware engine” should be understood to encompass a tangible entity, be that an entity that is physically constructed, permanently configured (e.g., hardwired), or temporarily configured (e.g., programmed) to operate in a certain manner or to perform certain operations described herein. As used herein, “hardware-implemented engine” refers to a hardware engine. Considering embodiments in which hardware engines are temporarily configured (e.g., programmed), each of the hardware engines need not be configured or instantiated at any one instance in time. For example, where a hardware engine comprises a general-purpose processor configured by software to become a special-purpose processor, the general-purpose processor may be configured as respectively different special-purpose processors (e.g., comprising different hardware engines) at different times. Software accordingly configures a particular processor or processors, for example, to constitute a particular hardware engine at one instance of time and to constitute a different hardware engine at a different instance of time.

Hardware engines can provide information to, and receive information from, other hardware engines. Accordingly, the described hardware engines may be regarded as being communicatively coupled. Where multiple hardware engines exist contemporaneously, communications may be achieved through signal transmission (e.g., over appropriate circuits and buses) between or among two or more of the hardware engines. In embodiments in which multiple hardware engines are configured or instantiated at different times, communications between such hardware engines may be achieved, for example, through the storage and retrieval of information in memory structures to which the multiple hardware engines have access. For example, one hardware engine may perform an operation and store the output of that operation in a memory device to which it is communicatively coupled. A further hardware engine may then, at a later time, access the memory device to retrieve and process the stored output. Hardware engines may also initiate communications with input or output devices, and can operate on a resource (e.g., a collection of information).

The various operations of example methods described herein may be performed, at least partially, by one or more processors that are temporarily configured (e.g., by software) or permanently configured to perform the relevant operations. Whether temporarily or permanently configured, such processors may constitute processor-implemented engines that operate to perform one or more operations or functions described herein. As used herein, “processor-implemented engine” refers to a hardware engine implemented using one or more processors.

Similarly, the methods described herein may be at least partially processor-implemented, with a particular processor or processors being an example of hardware. For example, at least some of the operations of a method may be performed by one or more processors or processor-implemented engines. Moreover, the one or more processors may also operate to support performance of the relevant operations in a “cloud computing” environment or as a “software as a service” (SaaS). For example, at least some of the operations may be performed by a group of computers (as examples of machines including processors), with these operations being accessible via a network (e.g., the Internet) and via one or more appropriate interfaces (e.g., an Application Program Interface (API)).

The performance of certain of the operations may be distributed among the processors, not only residing within a single machine, but deployed across a number of machines. In some example embodiments, the processors or processor-implemented engines may be located in a single geographic location (e.g., within a home environment, an office environment, or a server farm). In other example embodiments, the processors or processor-implemented engines may be distributed across a number of geographic locations.

Language

Throughout this specification, plural instances may implement components, operations, or structures described as a single instance. Although individual operations of one or more methods are illustrated and described as separate operations, one or more of the individual operations may be performed concurrently, and nothing requires that the operations be performed in the order illustrated. Structures and functionality presented as separate components in example configurations may be implemented as a combined structure or component. Similarly, structures and functionality presented as a single component may be implemented as separate components. These and other variations, modifications, additions, and improvements fall within the scope of the subject matter herein.

Although an overview of the subject matter has been described with reference to specific example embodiments, various modifications and changes may be made to these embodiments without departing from the broader scope of embodiments of the present disclosure. Such embodiments of the subject matter may be referred to herein, individually or collectively, by the term “invention” merely for convenience and without intending to voluntarily limit the scope of this application to any single disclosure or concept if more than one is, in fact, disclosed.

The embodiments illustrated herein are described in sufficient detail to enable those skilled in the art to practice the teachings disclosed. Other embodiments may be used and derived therefrom, such that structural and logical substitutions and changes may be made without departing from the scope of this disclosure. The Detailed Description, therefore, is not to be taken in a limiting sense, and the scope of various embodiments is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled.

It will be appreciated that an “engine,” “system,” “data store,” and/or “database” may comprise software, hardware, firmware, and/or circuitry. In one example, one or more software programs comprising instructions capable of being executable by a processor may perform one or more of the functions of the engines, data stores, databases, or systems described herein. In another example, circuitry may perform the same or similar functions. Alternative embodiments may comprise more, less, or functionally equivalent engines, systems, data stores, or databases, and still be within the scope of present embodiments. For example, the functionality of the various systems, engines, data stores, and/or databases may be combined or divided differently.

“Open source” software is defined herein to be source code that allows distribution as source code as well as compiled form, with a well-publicized and indexed means of obtaining the source, optionally with a license that allows modifications and derived works.

The data stores described herein may be any suitable structure (e.g., an active database, a relational database, a self-referential database, a table, a matrix, an array, a flat file, a documented-oriented storage system, a non-relational No-SQL system, and the like), and may be cloud-based or otherwise.

As used herein, the term “or” may be construed in either an inclusive or exclusive sense. Moreover, plural instances may be provided for resources, operations, or structures described herein as a single instance. Additionally, boundaries between various resources, operations, engines, engines, and data stores are somewhat arbitrary, and particular operations are illustrated in a context of specific illustrative configurations. Other allocations of functionality are envisioned and may fall within a scope of various embodiments of the present disclosure. In general, structures and functionality presented as separate resources in the example configurations may be implemented as a combined structure or resource. Similarly, structures and functionality presented as a single resource may be implemented as separate resources. These and other variations, modifications, additions, and improvements fall within a scope of embodiments of the present disclosure as represented by the appended claims. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Conditional language, such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more embodiments or that one or more embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular embodiment.

Although the invention has been described in detail for the purpose of illustration based on what is currently considered to be the most practical and preferred implementations, it is to be understood that such detail is solely for that purpose and that the invention is not limited to the disclosed implementations, but, on the contrary, is intended to cover modifications and equivalent arrangements that are within the spirit and scope of the appended claims. For example, it is to be understood that the present invention contemplates that, to the extent possible, one or more features of any embodiment can be combined with one or more features of any other embodiment. 

1. A system comprising: one or more processors associated with a server; and a memory storing instructions that, when executed by the one or more processors, cause the system to perform: transmitting, from a server, to a first client device, one or more resources for an investigation to be performed remotely from the server; receiving, by the server, results of the investigation performed by the first client device; recording, in a database associated with the server, a vector clock indicating a change in the one or more resources from the results of the investigation, the change identifying the first client device as initiating the change; deconflicting the change with other changes based on the vector clock; and transmitting an indication to a second client device regarding the change while hiding at least a portion of the vector clock from the second client device.
 2. The system of claim 1, wherein the instructions further cause the one or more processors to perform: restricting the second client device from transmitting permanent copies of the results while permitting the second client device to transmit temporary copies of the results.
 3. The system of claim 1, wherein the instructions further cause the one or more processors to perform: synchronizing the results of the investigation between the first client device and a third client device.
 4. The system of claim 1, wherein the instructions further cause the one or more processors to perform: setting a duration during which a connection between the first client device and the server remains active in an absence of any data exchange; and in response to a time period during which data exchange is absent exceeding the duration, closing the connection.
 5. The system of claim 1, wherein the hiding at least a portion of the vector clock from the second client device comprises hiding that the first client device made the change and indicating the server made the change.
 6. The system of claim 1, wherein the instructions further cause the one or more processors to perform: importing a first object from a third client device and a second object from a fourth client device; performing a concurrency check using the vector clock including an identification of the third client device that imported the first object and an identification of the fourth client device that imported the second object; determining whether to store the first object or the second object; in response to determining to store the first object or the second object: removing a portion of the vector clock indicating the third client device or the fourth client device; and storing a remainder of the vector clock following removal of the portion.
 7. The system of claim 1, wherein the instructions further cause the one or more processors to, during an operation to import one or more objects at the server from the first client device and the second client device: perform concurrency checks with full vector clock information; apply the one or more objects or place the one or more objects in pending; for each happens-after object of the one or more objects, create a local data event, remove a client device-part of the full vector clock information, and store a remainder of the clock information after removing the client device-part.
 8. The system of claim 1, wherein the resource comprises an aerial view map overlaid with emergency routes.
 9. The system of claim 1, wherein the instructions further cause the one or more processors to perform: during an export operation to transmit the results of the investigation including the change to the second client device (320), adding back the portion of the vector clock.
 10. The system of claim 9, wherein the instructions further cause the one or more processors to perform: determining the portion to add back based on a table that identifies a local data event at which an object was imported to the server and maps the local data event to the portion.
 11. A method implemented by a computing system including one or more processors and storage media storing machine-readable instructions, wherein the method is performed using the one or more processors, the method comprising: transmitting, from a server, to a first client device, one or more resources for an investigation to be performed remotely from the server; receiving, by the server, results of the investigation performed by the first client device; recording, in a database associated with the server, a vector clock indicating a change in the one or more resources from the results of the investigation, the change identifying the first client device as initiating the change; deconflicting the change with other changes based on the vector clock; and transmitting an indication to a second client device regarding the change while hiding at least a portion of the vector clock from the second client device.
 12. The method of claim 11, further comprising: restricting the second client device from transmitting permanent copies of the results while permitting the second client device to transmit temporary copies of the results.
 13. The method of claim 11, further comprising: synchronizing the results of the investigation between the first client device and a third client device.
 14. The method of claim 11, further comprising: setting a duration during which a connection between the first client device and the server remains active in an absence of any data exchange; and in response to a time period during which data exchange is absent exceeding the duration, closing the connection.
 15. The method of claim 11, wherein the hiding at least a portion of the vector clock from the second client device comprises hiding that the first client device made the change and indicating the server made the change.
 16. The method of claim 11, further comprising: importing a first object from a third client device and a second object from a fourth client device; performing a concurrency check using the vector clock including an identification of the third client device that imported the first object and an identification of the fourth client device that imported the second object; determining whether to store the first object or the second object; in response to determining to store the first object or the second object: removing a portion of the vector clock indicating the third client device or the fourth client device; and storing a remainder of the vector clock following removal of the portion.
 17. The method of claim 11, further comprising: during an operation to import one or more objects at the server from the first client device and the second client device: perform concurrency checks with full vector clock information; apply the one or more objects or place the one or more objects in pending; for each happens-after object of the one or more objects, create a local data event, remove a client device-part of the full vector clock information, and store a remainder of the clock information after removing the client device-part.
 18. The method of claim 11, wherein the resource comprises an aerial view map overlaid with emergency routes.
 19. The method of claim 11, further comprising: during an export operation to transmit the results of the investigation including the change to the second client device (320), adding back the portion of the vector clock.
 20. The method of claim 19, further comprising determining the portion to add back based on a table that identifies a local data event at which an object was imported to the server and maps the local data event to the portion. 